Perhaps based on the original Windows 3.1 file manager, or more recently on many of Apple's products, a hierarchy of folders (or other containers) at the left, and clickable nodes display the content at the right. See iTunes as the most ubiquitous example, but it is used for countless desktop software applications or web sites that have a user-editable hierarchy, including drag & drop for moving either nodes or containers, rename (in place) of nodes or containers, and reflection of the node title in the title of the content at right.